Help me choose a cam!

[gambling209]

make sure that your truck motor has a roller cam. not all do. no pro to add, just need some extra parts. changing your rocker to 1.7 from 1.6 movers the power band up. not sure that is what you want. going with and aftermarket cam with bigger lift will mean new springs in the heads. if on the cheap. run the stock h.o. cam. if you buy most any after market cam, might as well get one custom ground. about the same money. don't go too big. you will regret it.

 

[cldonley]

make sure that your truck motor has a roller cam. not all do. no pro to add, just need some extra parts. changing your rocker to 1.7 from 1.6 movers the power band up. not sure that is what you want. going with and aftermarket cam with bigger lift will mean new springs in the heads. if on the cheap. run the stock h.o. cam. if you buy most any after market cam, might as well get one custom ground. about the same money. don't go too big. you will regret it.

Trying to understand how changing the ratio to create more valve opening/duration is different from a cam with more lift, unless it has to do with lobe separation angle? Leaning toward using the stock cam and doing a 4 degree advance as some have suggested.

 

[gambling209]

this is a little over simplified but, the bigger the duration number the higher the rpm needs to be to take advantage of the new cam. when cubic inches stay the same. as for lift. with a bad set of heads, like stock heads, the rpms need to be higher to get the increase in air flow. have seen many dyno tests on the 1.7 with the ho cam in mustang mags. they are only good for less than 10hp. and the power found higher in the rpm range. duration really doesn't change with increased lift. so advancing your cam makes the duration number smaller, making the power come on sooner. it also tops out sooner.